Find a unit vector perpendicular to both the vectors ` 2 hat (i) - 3 hat (j) + 6 hat

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Find a unit vector perpendicular to both the vectors ` 2 hat (i) - 3 hat (j) + 6 hat (k) and 3 hat (j) - 4 hat (k) ` . Also find the sine of the angle between the given vectors .
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